20632973 has 2 divisors, whose sum is σ = 20632974. Its totient is φ = 20632972.

The previous prime is 20632961. The next prime is 20632999. The reversal of 20632973 is 37923602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15976009 + 4656964 = 3997^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 20632973 - 2²⁴ = 3855757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20632933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10316486 + 10316487.

It is an arithmetic number, because the mean of its divisors is an integer number (10316487).

Almost surely, 2^20632973 is an apocalyptic number.

It is an amenable number.

20632973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20632973 is an equidigital number, since it uses as much as digits as its factorization.

20632973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 20632973 is about 4542.3532447400. The cubic root of 20632973 is about 274.2756607359.

The spelling of 20632973 in words is "twenty million, six hundred thirty-two thousand, nine hundred seventy-three".